Boston, MA – June 5, 2008- RockPort Capital Partners announced today the close of its third venture capital fund with commitments of over $450 million, making it one of the largest venture funds focused on clean technology investments. With nearly $850 million under management, RockPort is one of the nation’s leading venture capital firms.

RockPort partners with clean tech entrepreneurs to build innovative companies and bring disruptive technologies and products to the 21st century. New investors in RockPort include nationally known endowments, institutional investors and foundations.

Continuing the core investment focus of earlier funds, RockPort’s Fund III will invest in the development of technology and products in emerging clean tech companies. Through collaboration with entrepreneurs bringing innovative products to the rapidly growing clean tech marketplace, Rockport will support the introduction of important new solutions to an energy and resourceconstrained world.

“The clean tech sector provides enormous opportunities to identify and foster initiatives that offer solutions to global energy and natural resource needs, while providing superior investment returns,” said Wilber James, a RockPort Managing General Partner. “We have already seen how the teams we invest in can create enormous value. Our collaborative approach together with a business-building mentality and keen domain expertise has proven invaluable to growing companies.”

David Prend, also a Managing General Partner, added “We are very pleased with the quality and preeminence of our new and returning investors, and gratified by the confidence they have placed in us as managers. They recognize that RockPort has a proven track record of bringing clean tech expertise, thought leadership, insight and a diverse network to our portfolio companies.”

Since its founding in 2000, RockPort Capital Partners, with offices in Boston, Massachusetts and Menlo Park, California, has invested in nearly 40 clean tech companies.

The RockPort team consists of Managing General Partners William “Wilber” James and David Prend, and General Partners Hap Ellis, Janet James, Chuck McDermott, and Todd Wilson. With over 100 years of combined experience in energy and materials-related businesses, RockPort has a global clean tech network, perspective and reach in industries such as power, energy, water, lighting, transportation, and building products.

About Rockport Capital Partners

RockPort Capital Partners is a leading venture capital firm partnering with clean tech entrepreneurs around the world to build innovative companies and bring disruptive technologies and products to the 21st century. RockPort’s investment approach is distinguished by collaboration with management teams to foster growth and create value. Combining domain expertise with policy and international experience, RockPort has a proven track record of leveraging its insights and networks to foster growth and create value.